Damper for furnaces.



C. A. RAGGIO. DAMPER FOR PUENAGBS. APPLIGATION FILED Dnc. 23, 1913.

1,1 19,041. Patented Dec.1,1914v 3 SHEETS-SHEET l.

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DAMPER FOR FURNAGES.

APPLIGATION FILED DB0. z3. 1913.

1,1 1 9,04 1 .Patented Dec. 1, 1914.

a SHEETS-SHEET a.

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I lT- l l 1 l I /3 ERS COU FHUTULITHO, WASHINt-ITON. D, C

l .UNITED OFFICE CHARLES A. RAGGIO, or CHICAGO, vILL'IivoIs.

To all whom itmoy concern: e

Be it known that I, CHARLES A. Rnssio, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Dampers forFurnaces, of which the following is a specification.

TheV present i invention has reference to certain improvements in furnace dampers of the type intended for usein the flues leading from the furnace to the chimney;

More particularly the invention has reference to certain improvements in dampers of the foregoing type, and lwhich are intended to permit the entrance of fresh air into the-flue, vwhich freshy air flows by a counter current movement back through the flue into the furnace. The admission of the fresh air into the furnace in this manner serves to supply the necessary oxygen for carrying on the `combustion within the fur-` nace at the ordinary or normal rate lor intensity, without the necessity of leaving the furnace or ash pit doors open during normal Aby heated by the waste `heat whichisgoing up` the flue. In this manner a considerable portion of the waste heat isV conserved so `that the eiiiciency or economy of the furnace is greatly improved. Atthe same time the preheating'of the air permits the attainment of a higher temperature of combustion than would otherwise be possible. y

In connection with the foregoing object another object is 4to so design and construct the damper that the incoming air will be forced to travel through passages of considerable length within the damper, thereby maintaining the incoming air in contact with the surface of the damper for .as long a period as: possible.

Still anotherobject of, theinvention in `connection .with the foregoing is to so construct'the damper that the fresh air may be simultaneously admitted to both sides of the damper, the air admitted tol one side traveling through thebody of the damper adjacent to one of thefaces thereof, and the air admitted to the other side of the damper traveling through the body of the damper adjacent to the other surface thereof.V Another object of the invention is to so -DAivirnn ron rUaNAcns.

`Specification of Letters Patent. j i `latnjf-d Dec, 1, 1914, Application filed December 23,1513. Serial No.v8{i8,388. i

o'ut the necessity of cutting or opening theA flue other than the forming of a pair of oppositely disposed holesinthe flue.

Still another object of the invention is to i so construct the damper that the fresh air admitted through it `will be delivered into `the bottoinportion of the iue `where Iit will be separated `as much aspossible from the outgoing hot Aburned gases, thereby. obtaining the aforementioned counter current movement with a minimum of interference between the incoming fresh air and the outgoing burned gases. Y

In this connection a still `further object is to provide the damperwith' an` operating handle, whereby its position can be controlled from time to time, and to so form the said handle or its connection to the damper that, when thehandle is connected to-either side ofthe damper, it will maintain such` a definite-relationshipfto the delivery opening in the damper that an indication willalways be given as to when the said opening stands in the lower portion of the flue. In this` connection it is also ldesired to provide a construction such that the handle may be connected toeither side ofthe damper asdesired, assurance being'had that y damper embodying the features of the present invention connected into the flue leading to the chimney; Fig. 2 shows a cross section through the flue with the damper mounted in position, the damper standing in normal or operating position; Fig. 3 shows a section taken on the line 3-3 of Fig. 2, looking in ,the direction of the arrows; Fig/4 shows a vertical ysection through the damper mounted in position within the iiue being taken on the line 4 4 of Fig. 2, looking in the direction of the arrows; Fig. 5 shows a horizontal section through the damper mounted in position within the iue being -taken on the line 5 5 of Fig. 2, looking in the direction kof the arrows; Fig. 6 is a front View of the damper with the front plate removed; Fig. 7 is a back View of the damper withthe backi plate removed; Fig. 8 is a front vieW of a modifiedv construction of damper, the

front plate being removed; and Fig. 9 is a front view of another modification'also vwith the front plate removed.

. InFig. 1',"'the"furnacefis designated'by the numeral 10,'and' the ffluefleading to= the chimney bythe numeralll.` As indicated f in this ligureythe damper 12,-Vto ywhich the *presentv invention relates; isv to be locatedzin the flue l1, `and preferably' close/upto' the point of connection of y'said *flue into the furnace. As previously"statedyit 1hasi'been v found"y by' experience 'thati freshair' -maybe admitted-*into theflower lportion ofthe flue atA a` pointeclose'xup to thefurnace, which airfwi'll dropfbac'lc'in-to: the furnace to suplpl-y the necessaryfoxygenfor consumption Without-'the necessity of openingfthe furnaceor ash'pitdoors. s

{Ineach of the several-"damper constructions il'lustrated in; the drawings,` there is provided abody' portion-'13- aga'inst "which the'l front-and' baclr pla-tes 14`-an`d15y respectivelyllie. Thebody portion ispr`ovided Von each-side withan outstandinghollow arm 'or lthe. like 16, which arms serve as bearings or pivotal f points for? the` dain'p'er itself. Thesem'mscanf-bel readily 'inserted through V'holesli-inthe sides-of the flue, so

" 1'thatthe damper, to' which* the presentffin- `vention relates,`can :be connectedinto the "flueby the drilling of said -holesand by distorting the shape of thefiueafslightamount 'to allow thefarms to rbe inserted. -Thelbo'dy portion 13- of the damper is so constructed thatthe' hollow armat 'one side communi- Cates-withl the front face/of the body; portion, lwhile 'thefhollow arm-fat the'other side communicates with the rear ffacevthereof. This construction is= -vve'llr illustrated Ainsi Fig. 5. "En'circl-ing' the edgesfoff thel body portionlfaref-the vflanges 18 andf19,1fwhich hrotrude fromi thef'frontfand rear faces-respectively. The front and -backoover'plates rest against Atheseflange's. Ht," therefore,l followsthat an'air space `'is providedon each side yoftheldampergone"a1r space'bemg 'elosed' by the vFfront cover plate, and the ,Y As shownz-inFigs. 2, 4, 6,'7, and 8, it is preferred that this perforation 'be located in'thefupper' portion of the damper, inasmuchas thehotter gases willstrave'l along the upper portion of themfiue. FmF-urtltierd y more, by adopting this arrangement, the incoming air will be effectively separated from( the outgoing hot gases, so that the cur- Y rent of air willbe delivered to the furnace in.. as, pure a `'state or condition ias.- possible,

and witha minimum amount of mixtureor dilutionwith the lburned gases. Surround- @Thelowenf portion fllthe back cover'-platel iscontinuous 'and' 'lunperfora-ted,lfwhereas the lower 'portion of the Ifront cover plate is prowffided fwiith Jone"'orrnore Ideliveryl openings"`f22,y through#which` the incoming: air is *delivered* into the lower? portion'of-.the Hue. In the. arrafngementffshown ,ri-niFigsJ 2i to J 7 in'olusiveyl the-f air coming dolwfnf through the *space off the rdamper in .Contact vwith fl the fronty -cov`er "pla-te'EV 14; I-is deli'vered di'rectly to the openings' 122 l into the yflower', portiony vof lthetflue. 'lfIn Herder to permit theiafirfwhich isf traveling 5 through* the space 1 iin contact `-vviththel baclvcover plate' l5 to fre`aoh.the openings-22, If-providearr opening f23 inf .the flower'fpo'rtion@ofthe body lof. theidamper. It, therefore,l ffollloiivs. that? the` freshuair inoomingl through` both .lof lthe .f hollow arms is ultimately delivered@r through'. the 'open-k lings-3222' fintol the! bottom portionof1 ther flue,

approximately one-half travelingthrough r theI damper:` adj acentifthe front cover.: plate, iand thef Iother -halfl traveling)l through '-the d'amperj adjacentilthefrear:cover'fplate.

1Inf' ord'er to insurella lma'ximum length of I air i afdj ace'nt totheirl respective cover! plates, 'If havejprovidedfpartitions Within the dam- *perf for 'causing Stheiairf tor circulategbackand "forth #before beingf ultimately delivered y through'f the vbpenfings 22. y.tnfthe arrange- .1 ment"` shown finiFigs; -6f andi 7, rib :or= partition 24C extends radially1on=eaoh"side yof'the @body portion-#from the center thereof: aplproximaltely to"` .theiperipherynthereof Another partitionl125extends infa.' curving imanv Y'ner fromfua f .-pointfof fjfunction 26 :with the corresponding. *ribl 5121i. to iafV point '127,2 and still another partition"28.zextends radiallyv from ftheL pa'rtitior125lto the' edge. of theff-damper. These partitions extende'outfe auf suiiioient distancei :tof rest :or: Contactagainstv the'v respective Ecover iwplates, .-so i that zigzag; channels -.or passages areprovided through which; the incoming air fis forced .to "travel @back and forth before it reaches the delivery? outlet 22. L

AThe'movement of the air -in the arrangement 'shown in'Fi'gs. Grand Tisclearly indicated 'bythearrows l 1 .'Inasmuch as the l"currents Aof incoming air flowing through i the twlo ffhalves fof the h'damper come rfrom .-thezopposite sides .thereof, it follows that the two streams of currents of air are traveling in opposite directions at every point throughout their movement,so that a maximum of heat absorption is obtained, and, consequently, the incoming air will be heated tothe maximum possible degree vFor this reason, the eiii ciency or economy of operation of the furf nace will be materially improved, inasmuch as the amount ofiheat absorbed by the incoming airis a substantial measure of the saving `in fuel consumption y' necessary to heat the air, if it be not preheated. Obviously any suitable means may be provided for retaining the cover plates in position with respect to the body portion13. In

`the particular arrangement shown in Figs.

i of my invention I sorelate this handle to the damper that thehandle gives an indication as to the position of the` air opening 22, soI

that the operator can tell when this opening stands in the lower portion of the flue. For

`this purpose,'a lug or the like 31 is formed on each of the outstanding hollow` arms, 'but the lug on one of the arms faces forward, while that on the other arin backward. The handle is provided with a sleeve 32 adapted to` slip over the hollow arm, said sleeve being in turn provided with a notch or the like 33 at the proper side for the reception of the corresponding lug 31. Inasniuch as the two lugs face in opposite directions, it follows that the arm will always stand in the same position with respect to the opening 22, `regardless of which of the hollow1 arms it may be mounted on. y For example, in

the arrangement illustrated in Figs. 1 :mdf/3 the arm depends or'hangs down, A spring 34 may be mounted on the sleeve 32, the one end of said spring bearingagainst the flue,

and the other yend bearing against the arm 30. This spring simply creates a pressure or friction on the arm which will hold the damper in any position into which it may be set. Cotter pins or the like 35 may be provided for holding theV damper properly in position within the flue.

The arrangements shown in Figs. 8 and 9 differ from that previously described,

chiefly in the form and arrangement of the partitions, and, consequently, in the shape and form of the air passages through the damper. The main difference between the arrangement shown in Figs. 6 and 7 and that shown in Fig. 8 is, that in the last named figure, there is provided an additional partition 36, so that an additional lthe hollow arms to the point of delivery in thelower portion` of the iiue. Fig.` `9 is a face view looking at the front of the damper I with the front cover plate removed. The heated air is delivered toward the observer. For this purpose a perforation 37 extends through the body of the damper from the back to the front thereof, said perforation lying` alongside of a pocket 38 von the front side of the damper.' The partitions 39 and 40 surround the opening and the pocket respectively, the opening in the front cover plate being of a size and shape to uncover the opening 37 and the pocket 38, but to contact with the partitions 39 and 40.

guided in said travel by the partitions 42 and lL-3. A tube or pipe 44 leads from the Vpoint l1 into the pocket 38, the air at the front side of the damper passing beneath said pipe in its spiral travel. Similarly a tube or pipe delivers the air at the back of the damper to the opening 37. The partition 43 is circular in form and incloses the opening 46, which in this case is the opening through which the hot gases are traveling to the chimney. 4 I

While I have herein shown and described only three forms of construction embodying features of my invention, still it will be understood that I am in no wise restricted to thesaid forms, except as may be called for in the claims, but that I include within the scope of my invention other equivalent arrangements operating in equivalent manners to produce equivalent results.`

I claim: y s 1. A ldamper of the class described, comprising a central body portion having a pair `of oppositely disposed hollow pivotal sup- ,side of the body portion to provide a chamber thereagainst, there being an opening in one of said plates, and both of the chambers communicating with said opening.

2. A damper of the class described, comprising a body portion having a pair of oppositely disposed hollow pivotal supporting portions, the perforations of said supporting portions communicating with opposite faces of the body member, a plate mounted on each side of the body portion to provide a chamber thereagainst, there being an opening in one of saidplates, and a plurality of partitions within each chamber to provide air passageways therein, both of said passageways communicating with said opening.

3. A damper of the class described, com- "prising albody portion havingfa pair lofpppositely disposed hollow pivotal-supporting portions, the perforations in .said supporting y portionsA 'oo1n1nunicating-with*the-'opposite H f faces othe body portion, a fplate'mounted "adjacent to each face of the lbody portion to @provide a chamber thereagainst; there being a'disoharge opening =in=`one 'ofsaid plates,a

pluralityffofpartitions -in eaohy chamber -to '-"O provide a=passageway for ainthereim-both ofsa'idl passageways -terminating in commu- -'11ieationl with-said opening,` and -therebeing anf opening extending through both lof the ilplatesand'through the body portion out of 2i5 communication" from said -paesageways 4.'A damper of the class described, Comprising a hollow member yhav-ing apartition "dividing vitsjinteriorportion intof front and u back` chambers, the hollow member i being 50 provided 4with j sidewise extending @pivotal Yportions, each' pivotal portion being; perfovratedy-the; vperrorations of the pivotal pory','tions communicating l-with *the aforesaid eh ambe'rs' and 'being adapted to'supplyfresh -2`5 Aair'tosaid Chambers, there being an opening establishing communication from said. cham- "bers yto the exterior of thedamper. j y

v "5. A damper of the class desoribed,com

w 'prising a hollow member having apartition -`30 "*divid'in'g its hollow' portion into front and rear chambers, the damper havingapair of 'oppositely 'disposed pivotal 1nembers,. each f-'pivotahmeniber' being perforated andthe lperforations of the' pivotal members oom- L "'munieating, with the aforesaidehambers to 'supply fresh air toi. said lChambers, there being" an 'opening 'in the ldamperestablishing communication between? the chambers vland the'exterior of the damper, .and there being `Q4-'0 an inolosing partition extending thronghlthe damper Vand through the chambers to" provide af perforation from' front'` to rear ofthe oh ambers.

prising a' hollowmen'lber having a idiviling v damper out of communication '-from thepartition-*serving to -f divide "the'h'o'llow' port'i'on thereofflinto lfrontandI` rear chambers, l'fthe're beingnHperforation"in therlower por- 'tionof said partition, and there'beingfa perfora-tiomin' thelow'er portioniof ftheeront of the damper; and there -being openings -in 'the side portions yofthe damper? to-per'mit the en-trance o'fairto 'the chambers. f

iZfbdamperp the class-described, com- '-prisinga hollow "member having a partiti on' serving-*toy dividethe *hollow portion into f front and 'rear 'ohannbers*there*being'4 a 'perforation=inf-the lower portion of saidkpartition; andf therejbeing" a "perforation in the *lowerportion ofi thefront" off they damper, wand therebeing openings iir"thedam'perV to permit` the' entrance of* air separately to the two chambers. j "-1 i 8. A damper of theA classdescribd, 'coniprising= ai hollow 'member having l a partition f-servin'gvto divide thehollowpo'rtionthereof Ainto il front 'and"rear"v eharnbers,"` there being ..Upenin'gsf in"the-f?daniperi-"to permit lthe 'entrance kof airf'ffseparately toy said 'f chambers, and* there' being "openings -infl the lowerf por- -f tion of "the"damperftoV permitfthe exit foi? air f froin-the *bhambers to *the* outside voff the Hamper; substantially Vas described.

i9. V`l`A damper of the'Y elassdesoribed, oom

prising a hollow member' havingf apartition yserving-todivide the hollow lportion thereof i into'frontfanid; rearf bhambers, and' having another inelosing `-part`ition. extending from front. -tofbabkfl and serving toi-permit the pas- Llsage'o i?.gas' througlrthe. danrper'out of oomf "munieationi from the' chambers,therel Ibeing *openings *in the damper' to permit the inflow of'air separately -to the jehan'ib'ers; and there being others openings inthe' lower portion of thefdamper to; permlit thefdeliveryl of vheated 'air` from 'theidamper to the outside thereof.

v ',GHARLESJA. RAGGIO.

fwitnesses: e i l i.

THOMAS"A'BANNING,Ur., FnANoEsMJFnosr 

